Difference Between 12 2 12 3 Wire

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Difference Between 12/2 And An Extension Cord? - Electrical

Should I use 12 or 14 gauge wire?

12-2 Wire vs 12-3 Wire | DoItYourself.com

What is the difference between 14-2 wire and 14-3

12-2 Wire vs 12-3 Wire | DoItYourself.com